Core trap or retainer



May Z0, 1930.

J. G. BOSWELL GORE TRP OR RETAINER Filed May 10, 1928 2 Sheets-Sheet 2 L7. l G, nwyeZZ reception of they core.

Patented.

U'Nirasrrs JAMES G.- BosnfnLnon remarcar, muxas, Assignee( or"`,ONEHALF k'rn'"vslrnuirnn L.' u

rea ses nnss, or rfannron'r, 'TEXAS conn 'rn-AP on 'RETAINER applicati@ nea Mayio, reas. serial No. 276.714.

the core'or cores as samples.

It is particularly aimed to provide astrucj ture in which thecatcher or trap does not turn' with the drill while obtaining alcore, and. it

is further a particular object to provide a4 construction wherein fine particles will not4 lodge behind operating partsto prevent the same from opening incidental'to entrance or The ,more specific objects and advantages willy become apparent from a considerationA orp the description following'taken in connection with accompanying drawings illustrating an operative embodiment, and wherein: s Y

vFigure 1 is a vertical sectional view taken centrally and longitudinally through the improved, device andadjacentdrilling equipment, ,v v, y

Figure isa plan view of the :improved device, K-

- Figure 3 is anelevationthereof, and

Figure 1 is a front elevation of one of the designates a core dri-'ll head which is to v be taken as conventional, the 'same being'pro'- vided with cutters as atk11 to` which water is supplied 'as usual through channels 12. The

v head1() isgenerally cylindrical,v and at its lower end is provided. with aI shoulder at 13. Into its upper end, a'core barrel 14 of con-k ventional forrnis threaded lasv at 15. vThe headjlO'is also providedwith screwthreads 16 for attachment as usual towell tubing.

' v The core barrel'lt extends inwardly so as'to provide a shoulder 17 rvatits lower end opposite the shoulder'l3. -f Between theishouldersfland 17, myimproved core catcher or trap .generally desig# nated 18,islooselyinounted;` "l

Referring specificallyv to the trap, atboth yits upper and lower ends, it is yprovidedwith a vguide and keeper `ring 19j.` The lrings 19. have heads 20 which are,inwardlyrextended rand provided with inclined orbeveledsurfaces 21. Skirts 22 extend from the edge 21.

Y curved portion 30 yand a relatively Riveted or otherwise i'astened to the skirts 2.22"'- as at 23 lare anchor ringsfl` which havev in-4 wardlyjoiset ilangesat 2,5 whichvprovide shoulders. I 5 Core lretaining Vor engaging blades' or. n- A.

arate from each other and used in any de sired lnumber to provide 4an annulargrip-g ping body for the core. Each blade at ,each

each other as particularly shown in Figure 2 and are generally arcuate to provide a centrall i constriction29, va relatively long Iandaflat shorter and more abruptly curved portion 31. A, Y' To accommodate the .overlapping and arrangement of the blades 29, uppergandlower i gersareshown at528l The blades 28 are sepv Y corners of one side of each of them are pref'- erabl'y'y notched or cut away as vat `32. 'The' blades 'are generallyofrectangular form as shown in the elevation in Figurell.

' In use, as the drill'advances, the corel en# ters the .cage or trap 18, engaging the constriction 29 and serving to spread the same,

whereby 'the core Ais eifectivelygripped by s Y the blades 29 Vsince they are :of spring metal. The expansion cf such blades "causes the trap` 18A to extend and this is permissible'due to the space not' being completelyv iilled 'bythe trap in the absence of a core. Thefblades29 rth'eclearance between the shoulders" 13 and 17,

and which wouldaiect expansion ofthe trap.

will be" 'realized 'also' @hat their@ While freely mounted in the device Adoes'not'tiuir'in-vr the core."A

cidental to its reception or engagement with x j VThe 'spacer 27 prevents.longitudinali cel-'Y vlapse or distortionvof'they partsas'thecoref.l n

and trap engage.-

y, t y l The spacer sleeve y27' may have various v Y V """1,'759,'775

e :openings 33 in its/Wall to Ypernuit application.y t and fastening kof the rivets 23 after the spring i bladesf28 and rings 19 and 24am assembled. 1 v A [Various'changesmaybe resorted kto* pro.

t' 5* vdedthey fall within the spirit and scope of y thelinventionl r i v v v Whatfisclaimed is :-'V l Y n LA core retainereomprsing ring memv- Y ,bersyspringr blades each '.haying a..heok at f Y lo each end engaging said members,vsaid1spring f blades'being resiliently constri'cted' through- VVout their length to providea eonstricted#passage intermediate of .their endstopengage a coreg 'v 'Y 15k core retainer comprisingring memv `bers, spring'blades1 Vhaving 'Vhksengaging Y- i 'sai'dfmembersaid spring bladesbeing resily i l ient-ly constrieted throughout their length to 3 Y 7.,. provide'a'eonstri'ctedlpassagewayintermed; 1320 ate of their-ends toeriga'ge'a core, and a guide l #and keeper ring'dispose'dever theheeks and f' g Lf'feonneted-tv theffirstmentiened rings- Y 1 Y' 1 3.Afcore retainer Comprising*ringuenri y y bers7 spring blades `havinghooksengaging xfzfilsaid'rnembers, said'springblades beingfresilv V"-ie'r'itly-constrietedthroughout' their length-te i fprOVide la cn'stricted passagewayfinternien m'diatej-f theirend'sto engage acoreyaiguide Y Y f Y f andrkeeper ring-dispsed over thehooksland Y-go'cennectedtovthefirstjmentioned ringsii'the v f K ffirstfmentioned rings having `shmi1ders,` and Y spacer member dispsed' between said shoulf ers; Y 1 V f4. fAf coreretainer comprising end` membersl V35=h1ving slots; about the-same,-spring blades-fatj-fj opposite vends vexten'dingY vrinto' said 'shits Y T wher'eby theylfarey mounted in `place', "said y Y 1 f spring `v`blar'desfiingfres'iliently yconstri'etedVv I throughout ytheir"length"ftjvprovide1 a con- Y Ofstricted passageway intermediate#Oftheir s ehds-tdengageaCore. Y `r Intestimony''WhereffI'aizifniysignature. W

- I'Y'TJAMESI. 'BO'SWELL 

